Position Size Calculator
Enter your account balance, risk percentage, entry price, and stop-loss to get the ideal position size in units and dollars.
Trade Parameters
$
%
$
$
$
$
Fill in your trade parameters to calculate position size.
Recommended Position Size
0
units
Dollar Risk
$0.00
1% of balance
Risk Per Unit
$0.00
entry − stop
Risk : Reward
—
add target for R:R
Trade Breakdown
| Account Balance | — |
| Risk Amount | — |
| Entry Price | — |
| Stop-Loss Price | — |
| Target Price | — |
| Commission | — |
| Stop Distance | — |
| Position Size (units) | — |
| Total Trade Value | — |
Risk Level
Conservative
0%
2% (standard)
10%+
Summary
Enter your account balance, risk percentage, entry price, and stop-loss to get the ideal position size in units and dollars.
How it works
- Enter your total account balance in the Account Balance field.
- Set the percentage of your account you are willing to risk on this trade (typically 1–2%).
- Enter the price at which you plan to enter the trade.
- Enter your stop-loss price — the price at which you will exit if the trade goes against you.
- Optionally enter the price per share or contract and commission to see exact dollar results.
- Read the recommended position size in units, the maximum dollar risk, and the risk-to-reward ratio.
Use cases
- Sizing stock trades so a single loss never exceeds 1–2% of your portfolio.
- Calculating lot sizes for forex trades based on account equity and pip risk.
- Determining how many shares or contracts to buy given a defined stop-loss level.
- Comparing position sizes across different entry and stop-loss scenarios.
- Teaching proper risk management to new traders.
- Quickly verifying that a planned trade fits within your daily risk budget.
Frequently Asked Questions
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Last updated: 2026-05-23 ·
Reviewed by Nham Vu